109091909 has 4 divisors (see below), whose sum is σ = 109159404. Its totient is φ = 109024416.

The previous prime is 109091893. The next prime is 109091911. The reversal of 109091909 is 909190901.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23251684 + 85840225 = 4822^2 + 9265^2 .

It is a cyclic number.

It is not a de Polignac number, because 109091909 - 2⁴ = 109091893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109091959) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31262 + ... + 34575.

It is an arithmetic number, because the mean of its divisors is an integer number (27289851).

Almost surely, 2^109091909 is an apocalyptic number.

It is an amenable number.

109091909 is a deficient number, since it is larger than the sum of its proper divisors (67495).

109091909 is an equidigital number, since it uses as much as digits as its factorization.

109091909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67494.

The product of its (nonzero) digits is 6561, while the sum is 38.

The square root of 109091909 is about 10444.7072242356. The cubic root of 109091909 is about 477.8198421811.

The spelling of 109091909 in words is "one hundred nine million, ninety-one thousand, nine hundred nine".